Составить 5 видов вопросов(общий, разделительный, альтернативный, специальный к второстепенным, спец вопрос к подлежащему) с ответами из предложения: several accepted methods are available for the appraisal during the different stages

What methods are available for thr appraisal during the different stages?
are several accepted methods available for the appraisal during the different stages?
Are several accepted methods available for the appraisal during the different stages or not available?
Several accepted methods are available for the appraisal during the different stages, aren't they?